A flue gas duct structure and denitrification system with uniformly distributed swan necks to buffer the flue gas flow field
By designing a smoke duct structure with uniform swan neck buffer flue in the denitrification device of the coal-fired power plant, and using the deflector to combine uniform flue gas flow velocity, the problems of uneven flue gas velocity distribution and blockage of denitrification ash bucket in the prior art are solved, and uniform flue gas distribution and normal ash falls are achieved.
Patent Information
- Application Number
- CN202111328005.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- Filing Date
- 2021-11-10
- Publication Date
- 2025-04-01
- Estimated Expiration
- 2041-11-10
AI Technical Summary
In the denitrification device of the ultra-low emission unit of existing coal-fired power plants, the swan neck buffer flue design leads to uneven distribution of flue gas, affecting the ammonia spray adjustment and uniform distribution of NH3/NOx concentration in the flue gas of the catalyst, and also has problems of flue wear and blockage.
A smoke duct structure with uniformly distributed swan neck buffer flue flue flow field is designed. Through the combination of the drainage section deflector and the correction section deflector, the flue gas is evenly distributed at the inlet and outlet of the smoke duct, and a lower open swan neck flue partition is set up in the swan neck buffer flue to prevent the flue gas from turbulent.
The uniformity of the flue gas before the ammonia spray grille is achieved, the ash-fall section of the denitrification ash bucket is blocked, the normal operation of the normal ash-fall and ash-transfer system is ensured, and the flue resistance and wear are reduced.
Smart Images
Figure CN113952833B_ABST
Abstract
Description
Technical Field
[0001] The present invention belongs to the technical field of denitration devices for ultra-low emission units in coal-fired power plants, and in particular relates to a flue gas duct structure and a denitration system for evenly distributed swan necks to buffer the flue gas flow field. Background Art
[0002] At present, the denitration devices of ultra-low emission units in coal-fired power plants are almost all arranged in a high-temperature and high-dust manner. As the operating time accumulates, the denitration system will experience catalyst fly ash blockage, wear and tear, collapse, and even the guide plate and flue will have varying degrees of wear problems. These blockage and wear problems caused by coarse fly ash directly affect the safe and economical operation of the unit. A swan neck buffer flue is set above the denitration ash hopper, such as Figure 1 As shown, in order to remove some of the large particles of fly ash entering the denitrification reactor. This type of swan neck buffer flue is generally designed just above the denitrification ash hopper, and a denitrification ammonia spraying grid is arranged downstream of the flue gas. Due to the turning of the flue and the sharp contraction near the rear wall, the velocity distribution before entering the ammonia spraying grid is uneven, which directly affects the difficulty of adjusting the ammonia spraying of the denitrification system, resulting in NH3 / NO in the flue gas entering the catalyst. x The uniformity of concentration distribution is poor; the elbow outlet tapers sharply near the rear wall, causing the flue gas to directly hit the rear wall flue, resulting in increased flue resistance; the flue gas in the denitrification system gradually shrinks at the rear wall, forming a high-speed area, which is very likely to cause flue wear problems. Summary of the invention
[0003] In order to solve the problems existing in the prior art, the purpose of the present invention is to provide a smoke and air duct structure and a denitrification system with a uniformly distributed swan neck buffer flue flue flue gas flow field. The present invention can ensure the uniformity of the flue gas velocity before entering the ammonia injection grid, while not blocking the ash falling section of the denitrification ash hopper, ensuring normal ash falling, so that the ash conveying system can normally transport the fly ash in the denitrification flue.
[0004] The technical solution adopted by the present invention is as follows:
[0005] A smoke and air duct structure with a uniformly distributed swan neck buffer flue gas flow field comprises a smoke and air duct body and a guide plate component, wherein the smoke and air duct body comprises a smoke and air duct inlet, a swan neck buffer flue and a smoke and air duct outlet which are connected in sequence, the guide plate component is arranged in the swan neck buffer flue, and a denitrification ash hopper is arranged at the bottom of the swan neck buffer flue;
[0006] The guide plate components include a downward-opening swan neck flue baffle, a plurality of guide plates for the flow guide section, and a plurality of guide plates for the correction section;
[0007] A plurality of guide plates of the guide section are distributed at intervals on the cross section of the smoke and air duct inlet, and the guide plates of the guide section can guide the smoke in the smoke and air duct inlet to the guide plates of the correction section;
[0008] A plurality of correction section guide plates are distributed at intervals on the cross section of the smoke and air duct outlet, and the plurality of correction section guide plates can correct the smoke guided out by all the guide section guide plates to be evenly distributed on the cross section of the smoke and air duct outlet;
[0009] There is a gap between the guide plate of the induction section and the guide plate of the correction section for dust to fall;
[0010] The downward-opening swan neck flue baffle is parallel to the smoke and air duct outlet, one end of the downward-opening swan neck flue baffle is connected to the top inflection point of the swan neck buffer flue, and a space for ash falling is left between the other end of the downward-opening swan neck flue baffle and the denitrification ash hopper inlet.
[0011] Preferably, the number of guide plates in the correction section is an integer multiple of the number of guide plates in the diversion section.
[0012] Preferably, the guide plate of the drainage section includes a first inlet section and a first outlet section, the first inlet section and the first outlet section are connected to form a folding plate structure, the first inlet section is parallel to the axis of the smoke and air duct inlet, the first outlet section is inclined toward the smoke and air duct outlet, and the first outlet sections of all the drainage section guide plates are parallel to each other.
[0013] Preferably, it also includes an air guide plate, which is located above the denitrification ash hopper, one end of the air guide plate is flush with the lower edge of the smoke and air duct inlet, and the other end of the air guide plate points to the lower end of the downward-opening swan neck flue partition, and the air guide plate is parallel to the first outlet section.
[0014] Preferably, the ends of all the first outlet sections facing the smoke and air duct outlet and the ends of the air guide plates facing the downward-opening swan-neck smoke duct baffles are in the same straight line;
[0015] The inflection points where the first inlet section and the first outlet section of all guide plates of the guide sections are connected and the ends of the guide plates facing the entrance of the smoke and air ducts are on the same straight line;
[0016] All first lead-ins have the same length.
[0017] Preferably, the first inlet sections of all the guide plates of the guide sections are evenly spaced on the cross section of the smoke and air duct entrance, and the guide plates and the first outlet sections of all the guide plates of the guide sections are evenly spaced;
[0018] The angle between the first outlet section and the axis of the smoke and air duct outlet and the angle between the air guide plate and the axis of the smoke and air duct outlet are not less than 45°.
[0019] Preferably, the correction section guide plate comprises a second inlet section and a second outlet section, the second inlet section and the second outlet section are connected to form a folded plate structure, the second outlet section is parallel to the axis of the smoke and air duct outlet, the second inlet section is inclined toward the smoke and air duct inlet side, and the second outlet sections of all correction section guide plates are parallel to each other;
[0020] A space for dust to fall is reserved between the second introduction section and the first outlet section.
[0021] Preferably, the ends of all the second outlet sections facing the smoke and air duct outlet are in the same straight line;
[0022] All the second lead-in sections have the same length, and the second lead-in sections are parallel to the first lead-out sections;
[0023] The inflection points where the second inlet sections and the second outlet sections of all correction section guide plates are connected are on the same straight line.
[0024] Preferably, all the second outlet sections are evenly spaced on the cross section of the smoke and air duct outlet;
[0025] The end of the downward-opening swan-neck flue partition facing the denitrification ash hopper is on the same straight line as the inflection point where the second inlet section and the second outlet section of all the correction section guide plates are connected.
[0026] The present invention further provides a denitration system, in which the smoke and air duct structure of the present invention having uniformly distributed swan necks to buffer the smoke flow field of the flue is provided.
[0027] The present invention has the following beneficial effects:
[0028] In the smoke and air duct structure of the smoke flow field of the uniformly distributed swan neck buffer flue of the present invention, the smoke at the inlet of the smoke and air duct can be initially made uniform by a plurality of guide plates of the guide section, and the smoke is guided and directed to the correction section guide plate, so that the correction section guide plate receives the smoke with relatively uniform distribution, and a plurality of correction section guide plates are distributed at intervals on the cross section of the smoke and air duct outlet, and a plurality of correction section guide plates can correct the smoke guided out by all the guide plates of the guide section to be uniformly distributed on the cross section of the smoke and air duct outlet, finally making the smoke distribution at the smoke and air duct outlet relatively uniform; the design of the bottom-opening swan neck flue baffle also helps to guide the smoke in the swan neck buffer flue, and prevents the smoke from having large turbulence in the swan neck buffer flue; at the same time, a space for ash falling is reserved between the guide plate of the guide section and the correction section guide plate, and a space for ash falling is reserved between the bottom-opening swan neck flue baffle and the inlet of the denitrification ash hopper, all of which are for ensuring the normal ash falling requirements. In summary, the present invention can ensure the uniformity of the flue gas velocity before entering the ammonia injection grid, while not blocking the ash falling section of the denitrification ash hopper, ensuring smooth ash falling, so that the ash conveying system can normally convey the fly ash in the denitrification flue. BRIEF DESCRIPTION OF THE DRAWINGS
[0029] Figure 1 It is a structural schematic diagram of the prior art;
[0030] Figure 2 Schematic diagram of the smoke and air duct structure of the present invention with uniformly distributed swan necks to buffer the smoke flow field of the smoke duct;
[0031] Among them: 1-smoke and air duct entrance, 2-guide plate of diversion section, 2-1-first inlet section, 2-2-first outlet section, 2-3-guide plate, 3-guide plate of correction section, 3-1-second inlet section, 3-2-second outlet section, 4-downward-opening swan neck flue partition, 5-smoke and air duct outlet, 6-ash outlet 1 of first denitrification ash hopper, 7-ash outlet of second denitrification ash hopper, 8-ash outlet of swan neck flue cavity, 9-desnitrification ash hopper, 10-flue body, 11-swan neck buffer flue. DETAILED DESCRIPTION
[0032] Specific embodiments of the present invention are given below. It should be noted that the present invention is not limited to the following specific embodiments, and all equivalent changes made on the basis of the technical solution of this application fall within the protection scope of the present invention.
[0033] Reference Figure 2 The smoke and air duct structure of the present invention evenly distributes the smoke flow field of the swan neck buffer flue, comprises a smoke and air duct body 10 and a guide plate component, the smoke and air duct body 10 comprises a smoke and air duct inlet 1, a swan neck buffer flue 11 and a smoke and air duct outlet 5 which are connected in sequence, the guide plate component is arranged in the swan neck buffer flue 11, and a denitrification ash hopper 9 is arranged at the bottom of the swan neck buffer flue 11; the guide plate component comprises a bottom-opening swan neck flue partition 4, a plurality of guide plates 2 for the drainage section and a plurality of guide plates 3 for the correction section; the plurality of guide plates 2 for the drainage section are spaced apart on the cross section of the smoke and air duct inlet 1, and the guide plates 2 for the drainage section can divert the smoke and air duct inlet 1 The flue gas is guided to the correction section guide plate 3; a number of correction section guide plates 3 are spaced apart on the cross section of the smoke and air duct outlet 5, and a number of correction section guide plates 3 can correct the flue gas guided out by all the guide section guide plates 2 to be evenly distributed on the cross section of the smoke and air duct outlet 5; a space for ash falling is reserved between the guide section guide plate 2 and the correction section guide plate 3; the lower-opening swan neck flue baffle 4 is parallel to the smoke and air duct outlet 5, one end of the lower-opening swan neck flue baffle 4 is connected to the top inflection point of the swan neck buffer flue 11, and a space for ash falling is reserved between the other end of the lower-opening swan neck flue baffle 4 and the entrance of the denitrification ash hopper 9.
[0034] As a preferred embodiment of the present invention, the number of guide plates 3 in the correction section is an integral multiple of the number of guide plates 2 in the induction section. In this case, the velocity uniformity of the flue gas before entering the ammonia injection grid can be ensured.
[0035] As a preferred embodiment of the present invention, the guide plate 2 of the guide section includes a first introduction section 2-1 and a first outlet section 2-2, the first introduction section 2-1 and the first outlet section 2-2 are connected to form a folded plate structure, the first introduction section 2-1 is parallel to the axis of the smoke and air duct inlet 1, the first outlet section 2-2 is inclined toward the smoke and air duct outlet 5, and the first outlet sections 2-2 of all the guide plates 2 of the guide section are parallel to each other. Preferably, the corner at the connection between the first introduction section 2-1 and the first outlet section 2-2 can be set in an arc shape, which helps to reduce the resistance during the flow of smoke.
[0036] As a preferred embodiment of the present invention, it also includes an air guide plate 2-3, which is located above the denitration ash hopper 9, one end of the air guide plate 2-3 is flush with the lower edge of the smoke and air duct inlet 1, and the other end of the air guide plate 2-3 points to the lower end of the downward-opening swan neck flue partition 4, and the air guide plate 2-3 is parallel to the first outlet section 2-2. The setting of the air guide plate 2-3 can not only guide the smoke above the denitration ash hopper 9, but also ensure normal ash falling.
[0037] As a preferred embodiment of the present invention, the ends of all first outlet sections 2-2 facing the smoke and air duct outlet 5 and the ends of the air guide plates 2-3 facing the downward-opening swan neck smoke duct baffle 4 are in the same straight line; the inflection points where the first inlet sections 2-1 of all guide plates 2 are connected to the first outlet sections 2-2 and the ends of the air guide plates 2-3 facing the smoke and air duct inlet 1 are in the same straight line; the lengths of all first inlet sections 2-1 are the same. The above structural designs are all to ensure that the resistance and flow of each channel are similar, and to ensure the uniformity of the smoke flow process.
[0038] As a preferred embodiment of the present invention, the first inlet sections 2-1 of all the guide plates 2 of the guide sections are evenly spaced on the cross section of the smoke and air duct inlet 1, and the guide plates 2-3 and the first outlet sections 2-2 of all the guide plates 2 of the guide sections are evenly spaced. This structural design can ensure the uniformity of the smoke flow process; the angle between the first outlet section 2-2 and the axis of the smoke and air duct outlet 5 and the angle between the guide plates 2-3 and the axis of the smoke and air duct outlet 5 are not less than 45°. This structural design helps to prevent dust accumulation and ensure normal dust falling.
[0039] As a preferred embodiment of the present invention, the correction section guide plate 3 includes a second introduction section 3-1 and a second outlet section 3-2, the second introduction section 3-1 and the second outlet section 3-2 are connected to form a folded plate structure, the second outlet section 3-2 is parallel to the axis of the smoke and air duct outlet 5, the second introduction section 3-1 is inclined toward the side of the smoke and air duct inlet 1, and the second outlet sections 3-2 of all correction section guide plates 3 are parallel to each other; a spacing for ash falling is reserved between the second introduction section 3-1 and the first outlet section 2-2 to ensure normal ash falling. Preferably, the corner at the connection between the second introduction section 3-1 and the second outlet section 3-2 can be set in an arc shape, which helps to reduce the resistance during the flow of smoke.
[0040] As a preferred embodiment of the present invention, the ends of all second outlet sections 3-2 facing the smoke and air duct outlet 5 are on the same straight line; all second inlet sections 3-1 have the same length, and the second inlet section 3-1 is parallel to the first outlet section 2-2; the inflection points connecting the second inlet section 3-1 and the second outlet section 3-2 of all correction section guide plates 3 are on the same straight line. The above structural designs are all to ensure that the resistance and flow of each channel are similar, and to ensure the uniformity of the smoke flow process.
[0041] As a preferred embodiment of the present invention, all second outlet sections 3-2 are evenly spaced on the cross section of the smoke and air duct outlet 5; the end of the lower-opening swan neck flue baffle 4 facing the denitrification ash hopper 9 is on the same straight line with the inflection point where the second inlet section 3-1 and the second outlet section 3-2 of all the correction section guide plates 3 are connected. The above structural design is to ensure that the resistance and flow of each channel are similar, and to ensure the uniformity of the smoke flow process.
[0042] The present invention further provides a denitration system, in which the smoke and air duct structure of the present invention with uniformly distributed swan necks to buffer the smoke flow field of the flue is provided.
[0043] Example
[0044] Reference Figure 2In the smoke and air duct structure of the evenly distributed swan neck buffer flue gas flow field of this embodiment, the guide plates 2 of the drainage section are evenly spaced on the cross section of the "swan neck" smoke and air duct inlet 1, and the bottom drainage section guide plate (i.e., the guide plate 2-3) is not provided with a horizontal straight section (i.e., the first inlet section 2-1), so as not to block the ash falling section of the denitrification ash hopper inlet, thereby ensuring that the ash falling port 6 of the first denitrification ash hopper can fall ash smoothly; the bottom drainage section guide plate (i.e., the guide plate 2-3) is not connected to the lower end of the lower-opening swan neck flue partition 4, and maintains a sufficient distance to ensure that the ash falling port 2 of the denitrification ash hopper can fall ash smoothly; the correction section guide plates 3 are evenly spaced on the cross section of the smoke and air duct outlet 5 The number of the guide plates 3 in the correction section is equal to or an integer multiple of the number of the guide plates 2 in the guide section according to the flow field simulation results; the outlet angle of the guide plate 2 in the guide section (i.e., the first outlet section 2-2) is consistent with the inlet angle of the correction guide plate 3 (i.e., the second inlet section 3-2); the guide plates 2 in the guide section and the guide plates 3 in the correction section divide the cross section of the smoke and air duct into several identical channels, and each steering angle is consistent, and the resistance coefficient is consistent, so the flow rate of each channel is basically the same, ensuring the uniformity of the flow velocity at the outlet of the smoke and air duct; the steering angles of the guide plates 2 in the guide section and the guide plates 3 in the correction section (i.e., the first outlet section 2-2 and the axis of the smoke and air duct outlet ( Figure 2 The angle between the vertical direction and the vertical direction in the middle should be ensured to be above 45 degrees, so as to ensure that the flue gas fly ash can smoothly slide down to the denitrification ash hopper on the guide plate; the upper end of the lower-opening swan neck flue baffle 4 is connected to the inflection point of the top of the swan neck flue, and the lower end of the lower-opening swan neck flue baffle 4 is in a straight line with the bending point of the correction section guide plate 3, but there is a gap for ash falling between the lower end of the lower-opening swan neck flue baffle 4 and the denitrification ash hopper 9, so that the lower-opening swan neck flue baffle 4 does not block the ash falling port 8 of the swan neck flue cavity, ensuring that the fly ash falls into the denitrification ash hopper normally, and keeps the whole parallel to the vertical outlet of the smoke and air duct.
[0045] The structure of the present invention retains the ash collection effect of the original swan neck flue and denitrification ash hopper. Under the action of the guide plate after the optimization of the swan neck buffer flue, the overall streamline distribution at the inlet and outlet is regular, the outlet flow velocity distribution is uniform, and the velocity distribution before entering the ammonia injection grid is uniform, which improves the ammonia injection adjustment ability of the denitrification system and the NH3 / NO in the flue gas entering the catalyst x The concentration is evenly distributed. By setting up this guide plate structure, the resistance of the original swan neck flue is reduced, achieving a resistance reduction effect. In summary, the smoke and air duct structure of the flue gas flow field of the uniformly distributed swan neck buffer flue of the present invention overcomes the shortcomings of the existing technology. While ensuring the uniformity of the velocity before entering the ammonia injection grid, the structure does not block the ash falling section of the denitrification ash hopper, ensuring smooth ash falling, and the ash conveying system can normally convey the fly ash in the denitrification flue.
Claims
1. A smoke and air duct structure with uniformly distributed swan necks to buffer the smoke flow field of the smoke duct, characterized in that: The invention comprises a flue body (10) and a guide plate component, wherein the flue body (10) comprises a smoke and air duct inlet (1), a swan neck buffer flue (11) and a smoke and air duct outlet (5) which are connected in sequence, the guide plate component is arranged in the swan neck buffer flue (11), and a denitrification ash hopper (9) is arranged at the bottom of the swan neck buffer flue (11); The guide plate component comprises a downward-opening swan neck flue baffle (4), a plurality of guide plates for the flow guide section (2) and a plurality of guide plates for the correction section (3); A plurality of guide section guide plates (2) are spaced apart on a cross section of the smoke and air duct inlet (1), and the guide section guide plates (2) can guide smoke in the smoke and air duct inlet (1) to the correction section guide plates (3); A plurality of correction section guide plates (3) are distributed at intervals on the cross section of the smoke and air duct outlet (5), and the plurality of correction section guide plates (3) can correct the smoke guided by all the guide section guide plates (2) to be evenly distributed on the cross section of the smoke and air duct outlet (5); A space for dust to fall is left between the guide plate (2) of the induction section and the guide plate (3) of the correction section; The lower-opening swan neck flue baffle (4) is parallel to the smoke and air duct outlet (5), one end of the lower-opening swan neck flue baffle (4) is connected to the top inflection point of the swan neck buffer flue (11), and a gap for ash falling is left between the other end of the lower-opening swan neck flue baffle (4) and the inlet of the denitrification ash hopper (9); The number of the guide plates (3) in the correction section is an integer multiple of the number of the guide plates (2) in the diversion section; The flow guide plate (2) of the flow guide section comprises a first inlet section (2-1) and a first outlet section (2-2); the first inlet section (2-1) and the first outlet section (2-2) are connected to form a folded plate structure; the first inlet section (2-1) is parallel to the axis of the smoke and air duct inlet (1); the first outlet section (2-2) is inclined toward the smoke and air duct outlet (5); and the first outlet sections (2-2) of all the flow guide plates (2) of the flow guide section are parallel to each other.
2. The smoke and air duct structure for evenly distributed swan necks to buffer the smoke flow field of the smoke duct according to claim 1, characterized in that: It also includes an air guide plate (2-3), the air guide plate (2-3) being located above the denitration ash hopper (9), one end of the air guide plate (2-3) being flush with the lower edge of the smoke and air duct inlet (1), the other end of the air guide plate (2-3) pointing to the lower end of the downwardly opened swan neck smoke duct partition (4), and the air guide plate (2-3) being parallel to the first outlet section (2-2).
3. The smoke and air duct structure for evenly distributed swan necks to buffer the smoke flow field of the smoke duct according to claim 2, characterized in that: The ends of all the first outlet sections (2-2) facing the smoke and air duct outlet (5) and the ends of the air guide plates (2-3) facing the downward-opening swan-neck smoke duct baffle (4) are located on the same straight line; The inflection point where the first inlet section (2-1) and the first outlet section (2-2) of all the guide section guide plates (2) are connected and the end of the guide plate (2-3) facing the smoke and air duct inlet (1) are located on the same straight line; All first lead-in sections (2-1) have the same length.
4. The smoke and air duct structure for evenly distributed swan necks to buffer the smoke flow field of the smoke duct according to claim 2, characterized in that: The first inlet sections (2-1) of all the guide plates (2) of the guide section are evenly spaced on the cross section of the smoke and air duct inlet (1), and the air guide plates (2-3) and the first outlet sections (2-2) of all the guide plates (2) of the guide section are evenly spaced; The angle between the first outlet section (2-2) and the axis of the smoke and air duct outlet (5) and the angle between the air guide plate (2-3) and the axis of the smoke and air duct outlet (5) are both not less than 45°.
5. The smoke and air duct structure for evenly distributed swan necks to buffer the smoke flow field of the smoke duct according to claim 4, characterized in that: The correction section guide plate (3) comprises a second introduction section (3-1) and a second outlet section (3-2), the second introduction section (3-1) and the second outlet section (3-2) are connected to form a folded plate structure, the second outlet section (3-2) is parallel to the axis of the smoke and air duct outlet (5), the second introduction section (3-1) is inclined toward the smoke and air duct inlet (1), and the second outlet sections (3-2) of all correction section guide plates (3) are parallel to each other; A space for dust to fall is reserved between the second introduction section (3-1) and the first outlet section (2-2).
6. The smoke and air duct structure for evenly distributed swan necks to buffer the smoke flow field of the smoke duct according to claim 5, characterized in that: The ends of all the second outlet sections (3-2) facing the smoke and air duct outlet (5) are located on the same straight line; All the second lead-in sections (3-1) have the same length, and the second lead-in sections (3-1) are parallel to the first lead-out sections (2-2); The inflection points where the second inlet sections (3-1) and the second outlet sections (3-2) of all the correction section guide plates (3) are connected are on the same straight line.
7. The smoke and air duct structure for evenly distributed swan necks to buffer the smoke flow field of the smoke duct according to claim 6, characterized in that: All the second outlet sections (3-2) are distributed at equal intervals on the cross section of the smoke and air duct outlet (5); The end of the downwardly opened swan neck flue baffle (4) facing the denitration ash hopper (9) is on the same straight line as the inflection point where the second inlet section (3-1) and the second outlet section (3-2) of all the correction section guide plates (3) are connected.
8. A denitrification system provided with a smoke and air duct structure having a uniformly distributed swan neck buffer flue gas flow field as described in any one of claims 1 to 7.
Citation Information
Patent Citations
Flue gas duct structure with uniformly distributed swan neck buffer flue flue gas flow field and denitration system
CN216171301U